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Normal blood pressure for an adult is below 120 systolic and 80 diastolic. The normal range is lower for children and teenagers, states Mayo Clinic.


A normal blood pressure reading is 120/80, according to the American Heart Association. The top number represents systolic blood pressure, while the bottom represents diastolic blood pressure, both of which are expressed in millimeters of mercury.


According to About.com, normal blood pressure is 120 millimeters of mercury during a heart contraction and 80 millimeters of mercury during relaxation. This results in blood pressure readings in the range of 120/70 to 140/90. Blood pressure readings that surpass that amount points to high normal blo


Systolic blood pressure values above 120 and diastolic blood pressure values above 80 are considered high, according to WebMD. Values between 120 and 139 for systolic, and 80 and 89 for diastolic blood pressure, indicate prehypertension. Values above 140 and 90, respectively, are indicative of hyper


The American Heart Association states that normal blood pressure readings are less than 120 systolic and 80 diastolic. Readings of 120 to 139 over 80 to 89 are considered prehypertension, while readings greater than 140 over 99 are considered high. Readings greater than 180 over 110 indicate a crisi


To take an accurate blood pressure reading, use a manual or digital blood pressure monitor. The first step is to take a person's pulse, followed by the application of the cuff. Once the cuff is in place, inflate and deflate the cuff and record the blood pressure, according to WebMD.


A normal blood pressure for a person is anything below 120 over 80, according to the American Heart Association. However, numbers too far below 120/80 can also be dangerous.


In adults 20 years of age and older, normal blood pressure numbers are below 120 mm Hg (systolic) and below 80 mm Hg (diastolic), according to the American Heart Association. Blood pressure is typically expressed as a ratio with the upper number on top.


When reading blood pressure numbers, the top number, known as the diastolic number, measures the pressure in millimeters of mercury inside the arteries when the heart muscle contracts, and the bottom, or diastolic, number measures the pressure within the arteries between heartbeats, according to the


A normal blood pressure reading measures 120/80 millimeters of mercury, as stated by WebMD. Blood pressure is a measure of the amount of force the blood has on arteries, with higher readings being more dangerous.